Introduction The search results explanations of hydrological data Depending on the parameter, the instrumental measuring or visual observation method is used for the hydrological observations. Instrumentally measured results are recorded in a digital format with respective units, but the visual results of the observations are recorded in coded form. Information from data search results are described with codes for these visually observed hydrological parameters: Water object situation; characterization of ice conditions and location; amount of ice; ice width; ice closeness; form of ice; ice development stage. Water object situation Information about water object situation in both winter and summer is described in coded form from hydrological gauge stations, which are located in rivers, lakes and reservoirs. is five-figure combination: Characterization of water object situation 123 45 Intensity of the phenomenon The first three figures characterize water object situation. Transcript with codes see the table below. The last two figures characterize intensity of phenomenon in water object. To encode intensity of phenomena use numbers: 01, 02, 03, 04, 05, 06, 07, 08, 09, 10, which indicate, that observed phenomenon covers respectively 10, 20, 30, 40, 50, 60, 70, 80, 90, un 100% from river width or body of visible water area. If the intensity does not determine, than use 00. The characteristic term of water object situation Ice development and destruction 511 grease ice 512 slush (thin) 512 slush (moderate or thick) 513 border ice in lakes and reservoirs (width less than 100 m) 514 fast ice in lakes and reservoirs (width more than 100 m) 515 shore ice 516 thin ice flow; ice drift in lakes and reservoirs 516 moderate or thick ice flow; ice drift in lakes and reservoirs 517 ice flow; ice from tributary, lake, reservoir 518 ice flow over ice cover 519 thin slush ice run 519 moderate or thick slush ice run 520 anchor ice 521 anchor iceland 522 immersed ice (on coastal shelf after level drop) 523 ice piles on the river bank 524 ice closing dike in the gauge cross-sections LEGMC The searching results explanations of hydrological data 1
The characteristic term of water object situation 525 ice closing dike upstream the gauge 526 ice closing dike downstream the gauge 527 channel is narrowed by ice formations downstream the gauge (connected with water level increase) 528 channel is narrowed by ice formations upstream the gauge (connected with water level drop) 530 ice jam upstream the gauge 531 ice jam downstream the gauge 532 ice jam is destroyed artificially 534 slush jam upstream the gauge 535 slush jam downstream the gauge 536 slush jam is destroyed artificially 537 water on ice 538 water flows over the ice surface (river frozen through; when water is under ice) 539 opening water near the river bank 540 ice has darkened 541 puddle 542 ice has lifted 543 initial ice movement 544 open channel (in ice) ice lane 545 ice melts on a place 546 ice ledge 547 glimmer ice 548 loose pack ice in lakes, reservoirs and rivers mouth stages 549 pancake ice in lakes, reservoirs and rivers mouth stages 550 ice field in lakes, reservoirs; river mouth stage field ice 551 crushed ice in lakes, reservoirs and rivers mouth stages 552 ground hummock 553 ice carries (carried away) from the coast - lakes, reservoirs 554 stranded pressure ice - lakes, reservoirs Ice cover 563 incompleted ice cover 564 opening in ice cover 565 ice over 566 hummocked ice cover 567 hummocked ice ridge 568 slush ice path 569 slush under ice 570 cracks in ice 571 flooding ice 572 ice bridge 573 layered ice (ice cover consists from different layers, between them is situated water or air intermediate layer) 574 depth ice (in consequence of immersed ice or river frozen through) 575 river (lake) frozen through 576 ice artificially destroyed (with icebreaker, dynamite and other technical features) 577 water on river ice Additional details information group for water object situation 600 Open water (chanell) 664 slack water (cross arm, which is located upstream or downstream, is frozen through or dried up) 660 wadi - river has dried up Overgrowing LEGMC The searching results explanations of hydrological data 2
The characteristic term of water object situation 622 aquatic vegetation at river bank 623 aquatic vegetation in whole cross - section 626 aquatic vegetation in gauge cross-section mown-out 627 aquatic vegetation laid down on river bed (in autumn) 628 aquatic vegetation has silted up (when fish pounds are lowered et.) 629 aquatic vegetation was lost because of river pollution Characterization of ice conditions and location Information about characterization of ice conditions and location is described in the coded form with two marks in coastal hydrological the gauges. The characteristic term of ice conditions and location Ice basic phenomena 00 early ice appearance (no old ice) 01 early ice appearance (old ice is remained) 02 shore ice has formed 03 fast ice has formed (width more than 200) 04 young ice appearance from another area (drifted) 05 old ice appearance from another area (drifted) 06 repeated ice formation in observed gauge area 07 the sea is covered with static ice until visible horizon (total freezing) 08 repeated total freezing 09 the first ice shearing 10 fast ice is partly broken open 11 fast ice is absolutely broken open 12 the sea is completely purified from ice Pack ice characteristic peculiarities 13 ice concentration is increased 14 ice concentration is decreased 15 stranded pressure ice at the coast 16 strong ice compacting and hummocking 17 slush jam at the coast with ridges and ice fronts from hummocks 18 ice carries (carried away) from the coast 19 polynia Packing ice location 20 packing ice is evenly located over the entire surface of the sea 21 packing ice is predominantly located on the north side 22 packing ice is predominantly located on the east side 23 packing ice is predominantly located on the south side 24 packing ice is predominantly located on the west side 25 packing ice is predominantly located at the coast, ice is rare in the sea or the sea is ice free 26 packing ice is predominantly located far from the coast, ice is rare at the coast or open water 27 packing ice is predominantly located by separate fields 28 packing ice is predominantly located on zones 29 separate pieces of ice on the sea surface Amount of open water in balls; fields, where are no ice 30 no open water 31 amount of open water 1-2 ball 32 amount of open water 3 ball 33 amount of open water 4 ball 34 amount of open water 5 ball 35 amount of open water 6 ball LEGMC The searching results explanations of hydrological data 3
The characteristic term of ice conditions and location 36 amount of open water 7 ball 37 amount of open water 8 ball 38 amount of open water 9 ball 39 amount of open water 10 ball (ice free) Direction, where is observed open water 40 no open water 41 open water is observed on the NE 42 open water is observed on the E 43 open water is observed on the SE 44 open water is observed on the S 45 open water is observed on the SW 46 open water is observed on the W 47 open water is observed on the NW 48 open water is observed on the N 49 open water fields are observed in different directions Packing ice direction 50 ice does not move 51 ice is moving on the SW 52 ice is moving on the W 53 ice is moving on the NW 54 ice is moving on the N 55 ice is moving on the NE 56 ice is moving on the E 57 ice is moving on the SE 58 ice is moving on the S 59 packing ice direction cannot be determined 65 hummocking 1 ball 66 hummocking 2 ball 67 hummocking 3 ball 68 hummocking 4 ball 69 hummocking 5 ball 70 ice destruction 1 ball 71 ice destruction 2 ball 72 ice destruction 3 ball 73 ice destruction 4 ball 74 ice destruction 5 ball 80 no snow on the ice 81 height until 4 cm 82 height 5-9 cm 83 height 10-14 cm 84 height 15-19 cm 85 height 20-29 cm 86 height 30-39 cm 87 height 40-49 cm 88 height 50-69 cm 89 height 70 cm and more 98 Hummock ridge 99 Hummock front Ice hummocking in balls Ice destruction in balls Snow thickness on ice Separate ice forms LEGMC The searching results explanations of hydrological data 4
Amount of ice Information about amount of ice (both static and drifting) is given in balls from the coastal hydrological gauges. Ball indicates the part of aquatory, what is covered with ice. Amount of ice 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10 balls indicate, that with ice is covered respectively 10, 20, 30, 40, 50, 60, 70, 80, 90 or 100 % from the sea aquatory. Amount of ice, ball Amount of ice, ball Ice width 0 ice free or less than 1 ball 5 6 1 1-2 6 7 2 3 7 8 3 4 8 9 4 5 9 10 Information from the coastal hydrological gauges about ice width is determined in kilometres. It is coded by scale. Ice width, km Ice width, km 0 ice free 5 2.0-4.0 1 less than 0.1 6 4.0-7.0 2 0.1-0.5 7 7.0-10.0 3 0.5-1.0 8 10.0-15.0 4 1.0-2.0 9 until visible horizon and opposite bank, if it is farther than 15.0 km Ice concentration In the coastal hydrological gauges ice concentration is called as pieces of ice, included new ice forms, relative to area, where those are located, and it is expressed in balls. Ice concentration is observed by scale from 0 until 10 balls. Ice concentration graphic scale in balls Form of ice In the coastal hydrological gauges forms of ice are ice fields and those forms. Those are coded by scale. Form of ice 0 ice free 1 new ice (frazil ice, grease ice and slush ice, shuga, pancake ice) 2 brash ice LEGMC The searching results explanations of hydrological data 5
3 small ice cake (< 2 m across) 4 ice cake (2-20 m across) 5 small floe (20-100 m across) 6 small floe (20-100 m across) and ice cake (2-20 m across) 7 medium floe (100-500 m across) 8 big floe (500-2000m across) 9 vast floe (>2000m across) Ice stage of development Information from the coastal hydrological gauges about ice stage of development (age composition) are coded by scale. Ice stage of development 0 ice free 1 frazil ice, grease ice, slush ice, shuga 2 pancake ice 3 dark nilas (<5 cm thick) 4 light nilas (5-10 cm thick) 5 grey ice (10-5cm thick) 6 grey-white ice (15-30cm thick) 7 thin-first-year ice/ white ice, first stage (30-50cm thick) 8 thin-first-year ice/ white ice, second stage (50-70 cm thick) 9 medium first-year ice (70-120 cm thick) LEGMC The searching results explanations of hydrological data 6